Cos square x + cos square x + 5 by 3 + cos square x minus 5 by 3 is equal to 3 by 2
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Answer:
cos x=4
Step-by-step explanation:
Cos2x+cos2x+5/3+cos2x-5=3/2
2(cos2x+cos2x+5)=3(3+cos2x-5)
2cos2x+2cos2x+10=9+3cos2x-15
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